function s1_generate_a_series_of_files(){
for i in {1..100}; do
	echo $1>/tmp/new_file$i
done
}
function s2_list_4_files_in_long_format_about_account_and_group(){
ls -l/etc/
{passwd,shadow,group,gshadow} | sort -d
}
function s3_find_items_related_to_given_username(){
grep -h $1/etc/{passwd,shadow} | sort -d
}
function s4_find_items_related_to_given_group_name(){
grep -h $1/etc/{group,gshadow} | sort -d
}
function s5_create_groups_for_given_group_names(){
groupadd rnd && groupadd itoperation
}
function s6_create_uer_and_set_their_group_as_required(){
useradd -G rnd adam && useradd -G rnd bob && useradd -G
itoperation calvin && useradd -G
itoperation david && useradd -G rnd edward
}
function s7_change_user_shell(){
usermod -s /usr/bin/sh adam && usermod -s /usr/bin/sh edward
}
function s8_set_password_change_policy(){
password -n 10 -x 60 -w 10 adam
password -n 10 -x 60 -w 10 bob
password -n 10 -x 60 -w 10 david
password -n 10 -x 60 -w 10 calvin
password -n 10 -x 60 -w 10 edward
}
function s9_set_password_for_five_users(){
	usernames=(adam bob calvin david edward)
	for i in $(seq 1 5); do
		echo "${usernames[$(($i-1))]}:$1" | chpassword
	done	
}
function s10_lock_bobs_password(){
usermod -L bob
}
function s11_include_adam_into_wheel_group(){
usermod -a -G wheel adam
}
function s12_change_files_permission(){
for i in {1..33}; do
	chmod -R 640 "/tmp/new_file$(($1*3))"
done
}
